IRS27951S IRS27952(4)S - International Rectifier

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IRS27951S IRS27952(4)S LO HO VS ILr VS Sensing Voltage OCP threshold VS Sensing is enabled when LO is high Figure 6: VS sensing over current protection PCB Layout Tips Distance between high and low voltage components: It is strongly recommended to place the components tied to the floating voltage pins (V B and V S ) near the respective high voltage portions of the device. Ground Plane: In order to minimize noise coupling, the ground plane should not be placed under or near the high voltage floating side. Gate Drive Loops: Current loops behave like antennas and are able to receive and transmit EM noise. In order to reduce the EM coupling and improve the power switch turn on/off performance, the gate drive loops must be reduced as much as possible. For the low-side driver, the return of the drive loop must be directly connected to the COM pin of the IC and separate with signal ground (power ground and signal ground have star connection at COM pin). Supply Capacitor: It is recommended to place a bypass capacitor (C IN ) between the V CC and COM pins. A 1μF ceramic capacitor is suitable for most applications. This component should be placed as close as possible to the pins in order to reduce parasitic elements. C BS Capacitor: The C BS capacitor should be placed as close as possible to the VB and VS pins. Routing and Placement: 1) The IC has only one COM pin for both signal return and power return, so it is strongly recommended to route the signal ground and power ground separately and with a star connection at the COM pin. 2) The RT pin provides a current reference for the internal oscillator and needs to be kept as clean as possible to avoid frequency jittering or duty-cycle mismatch between high-side and low-side. The components connected to this pin must keep away from the high frequency switching loop such as the gate driver loop and the VS node. The PCB traces connected to RT pin also need to be kept away from any switching node. 3) Connect CT capacitor directly to COM pin, don’t share the return with any other signal ground. 18 www.irf.com © 2012 International Rectifier November 8 th , 2012
IRS27951S IRS27952(4)S Layout Example: VS node Signal components are kept away from switching nodes Supply bypass capacitors are close to IC pins. Star connection at COM pin Additional Documentation Please refer to application note AN-1160 for more design details of IRS2795(1,2)(4). Several technical documents related to the use of HVICs are also available at www.irf.com; use the Site Search function and the document number to quickly locate them. Below is a short list of some of these documents. AN-1160: Design of Resonant Half-Bridge converter using IRS2795(1,2) Control IC DT97-3: Managing Transients in Control IC Driven Power Stages 19 www.irf.com © 2012 International Rectifier November 8 th , 2012
Page 1 and 2: IRS27951S IRS27952(4)S RESONANT HAL
Page 3 and 4: Table of Contents IRS27951S IRS2795
Page 5 and 6: IRS27951S IRS27952(4)S Absolute Max
Page 7 and 8: IRS27951S IRS27952(4)S Electrical C
Page 9 and 10: IRS27951S IRS27952(4)S Input/Output
Page 11 and 12: IRS27951S IRS27952(4)S VCC: Power S
Page 13 and 14: IRS27951S IRS27952(4)S Application
Page 15 and 16: IRS27951S IRS27952(4)S - For closed
Page 17: IRS27951S IRS27952(4)S User initiat
Page 21 and 22: IRS27951S IRS27952(4)S I CC Supply
Page 23 and 24: IRS27951S IRS27952(4)S Package Deta
Page 25 and 26: IRS27951S IRS27952(4)S Tape and Ree
Page 27 and 28: IRS27951S IRS27952(4)S Part Marking

IRS27951S IRS27952(4)S - International Rectifier

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